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Mike,
I've tried guiding with and without the UV/IR and it doesn't seem to make much difference and in fact I have heard some people recommend slightly defocusing the guide scope for better guiding and I understand the main reason to use the UV/IR filter is that these wavelengths don't come to focus at the same point as the visible spectrum.
Another advantage of using the UV/IR filter is that it will prevent dust getting on the CCD surface. You should be able to screw one on the front of your 1 1/4" DSI nosepiece.
Peter
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